Hjalmar lindestrom



(N0 Mqd'el.) 2 Sheets-She'et 1 H. LINDESTRUM.

MOWER No. 427,238. Patented May 6, 1890.

2 sheets-sheet 2.

(No Model.)

' H. LINDESTRUM.

MOWER.

No. 427,238. Patented May 6, 1890.

we NORRIS Wrens co., mwro-u'mo msmnsm, 0. c4

- UNITED STATES PATENT OFFICE.

HJALMAR LINDESTROM, OF CHICAGO, ILLINOIS, ASSIGNOR TO MARIA LAVISALINDESTROM, OF SAME PLACE.

MOWER.

SPECIFICATION forming part of Letters Patent No. 427,238, dated May 6,1890.

Application filed November 11, 1889. Serial No. 329,927. (No model.)

To all whom it may concern:

Be it known that I, I-IJALMAR LINDESTROM, a citizen of the Kingdom ofSweden and Norway, and a resident of Chicago, in the county of Cook andState of Illinois, have invented certain new and useful Improvements inMowers; and I do hereby declare that the following is a full, clear, andexact description thereof, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon, which formapart of this specification.

This invention relates to novel improvements in mowers; and it consistsin the features of construction and combinations of parts hereinafterfully described, and pointed out in the appended claims.

In the accompanying drawings, Figure 1 is a top plan view of a mowerconstructed in accordance with my invention, showing only a portion ofthe cutter-bar. Fig. 2 is a vertical sectional view on the line 2 2 ofFig. 1. Fig. 3 is a front elevation of the same. Fig. 4 is a detailperspective view of the reciprocating pawl. Fig. 5 is a detailperspective view of a portion of the supporting-frame, illustrating thebearing for the vibrating bell-crank, said figure comprising two parts.Fig. 6 is a detail perspective view of the vibrating bellcrank.

a indicates a seat for the driver, suitably connected with the arm 19 ofthe said frame, and a indicates the draft-beam of the machine.

0 indicates a cutter-bar of the usual construction, having a shoe C,provided with an uprising portion in the form of a sleeve 0,

which is secured upon the trunnion b of the supporting-frame.

C is a pitman pivoted at one end to theinner end of the cutter-bar, andprovided in its other end with a ball-socket, as shown at c.

The said pitman serves to communicatea reciprocatory movement to thecutter-bar. Reciprocatory motion is given to said pitman by means of avibrating bell-crank lever D, pivoted to'the supporting-frame B. Thesaid lever D has a forWardly-proj ect-ing long arm 01, provided at itsend with a ball (1 which ball is secured within the socket c of thepitman. The short arm (1 of said lever D projects laterally, and isprovided on its end with a ball d, which ball is secured within aball-socket v 6 upon a reciprocating double pawl E, hereinafter referredto. The said lever D is provided at the meeting-point of its arms withtwo studs 01 cl, located, respectively, on the upper and lower facesthereof. Just in the rear of the portion 19 of the arm 17 and on the armI) a lug b is cast or otherwise secured thereto. Said lug b is providedwith a bearing-aperture b into which the stud (Z upon the lever D isinserted.

B is a block or plate, having abase portion b and an overhanging lug orprojection 12 said lug b being provided in its under face with abearing-aperture b into which the stud d on the lever D is inserted. Thedistance between the under face of the lug b and the bottom of the baseb is equal to the thickness of the lever D at the base of the studs, sothat when the said lever is pivoted between the block 13 and lug b itwill have a firm and easy bearing therein.

As shown in Fig. 5, the block B is provided with bolt-holes 17 whichregister with boltholes I) upon the arm 1), whereby said block can besecured thereto.

The devices for giving a reciprocatory motion to said bell-crank lever Dcomprise a ratchet-wheel A and a double pawl or ratchetarranged faceswill always be in advance of their inclined faces when the wheel isrevolved by the forward movement of the machine. It is found convenientto face the said teeth with removable pieces of steel, as shown at a (0so that when the teeth are worn they can readily be repaired by theinsertion of new pieces. Furthermore, the wheel can be made of a metalof reduced cost as compared with that used if the teeth were of the samemetal as the rest of the wheel. The said ratchetwheel A is provided onboth sides with annular concentric depressions, forming the shoulders AA the diameter of the wheel at said shoulders being somewhat less thanthe diameter at the pitch-line of the teeth.

The double pawl E, before referred to, is forked or provided with twoarms E and E the distance between the outer ends of which is equal tothe diameter of the annular shoulders A A E is the upper or short arm,while E is the lower or long arm, as will be described. The end portionsof each of the said arms E E are slotted vertically to form fingers e eand e 6 the distance between said fingers being sufficient to permitthem to pass on either side of the ratchet-wheel and rest upon theannular concentric shoulders A A 1E indicates a guide-finger or pinlocated upon the forward end of the pawl, and entering a'guide-bearing Blocated upon the horizontal portion 6 of the arm 19 of thesupporting-frame. It is obvious that the engagement of the fingers ofthe arms E E with the annular shoulders serves to guide the rear portionof said pawl when the guide-finger guides the front end in an obviousmanner.

The arm E is provided at the rear portion of the fingers e and on itsupper face with a transversely-arranged detent-piece 6 secured inuprising lugs e 6 formed thereat. The said lugs are provided withregistering transverse openings,through which the detent-pi ece e ispassed and secured by set-screws 6 6 in the usual manner. The lower armE is provided near the forward end of the fingers c .and upon theirlower faces, with a transversely-arranged detent-piece e secured independing lugs e 6 formed thereat. The said lugs are provided withregistering transverse openings, through which the said detent-piece eis passed and secured by set-screws e 6 in an obvious manner. From theforegoing description it is obvious that the said detentpieces e 6 canbe easily removed and replaced when worn out, and,being rectangular incrosssection, they can be turned around to present an unworn edge; or anew piece can be furnished with very little trouble or expense, owing tothe simple form of the piece. 7

The operation of my invention is as follows: Upon reference to Fig. 2 itwill be seen that the detent-piece 6' stands in front of and over theratchet-wheel, while the detentpiece 6 is located beneath and in therear of the wheel. The fingers e e arc constantly in contact with theannular shoulders A The said double pawl is shown at the backward limitof its movement, or, more properly, just commencing to move forward.Said reeipro eating pawl has a range of movement equal to one-half ofthe distance between the points of two adjacent teeth. For instance, wewill assume that the teeth are two inches apart. Then the reciprocatingdouble pawl will have a movement of one inch. In said Fig. 2 it will benoted that the detent e is held from engagement with the teeth of theratchet-wheel by reason of the fingers e resting against the annularshoulder A The detent e being engaged by the ratchet-wheel, said pawl Ewill be moved forwardb as said ratchetwheel revolves. The detent 6 willmove forwardly, and consequently come nearer to the center of the wheel,as the fingers slide over the shoulder A The fingers e resting upon theshoulder A it is evident that the detentpiece 6 will be moved away fromthe center of the wheel as the pawl E is moved forwardly, and hence saiddetent-piece 6 will be disengaged from the ratchet-whee1, and suchdisengagement takes place simultaneously with the engagement of thedetent c with the ratchet-wheel. lVhen said detent e is engaged withtheratchet-wheel, the pawl E will be moved backwardly, and the reverse ofthe foregoing operation is performednamely, the detent e is graduallydisengaged from the wheel while the detent e is thrown into engagementtherewith. It is obvious that as a tooth moves toward the detentpiecewhile the detent-piece is carried towardthe tooth at the same rate ofspeed they will meet halfway, and consequently the pawl moves but oneinch in either direction. It follows from the foregoing that the pawlwill be reciprocated as the said ratchet-wheel is turned. Thereciprocating movement of said pawl E is imparted to the cutter-bar bymeans of the bell-crank leverD and pitman 0 as before described. Bymeans of the lever a and clutch mechanism it is manifest that theratchetwheel can be disconnected from the axle, so as not to turntherewith.

I claim as my invention In a mower, the combination, with the driving-wheels, supporting-frame, and cutter-bar, of a ratchet-wheel mountedon the drivingwheel shaft and adapted to receive rotary motiontherefrom, two annular concentric shoulders located one on either sideof and each having a diameter less than that of said ratchet-wheel, adouble pawl mounted in sliding bearings upon said supporting frame, andhaving a mot-i011 toward and from said ratchetwheel in a straight line,said pawl comprising two arms having bifurcated end portion embracingsaid ratchet-wheel and resting in contact with said shoulders, each ofsaid bifurcated end portions being provided on their outer faces withlugs, as e e e 2 having registering openings, within which are removablysecured detent-pieces, as e said IIO ' detent-pieces being so located asto engage In testimony that I claim the foregoing as the ratchet-wheelat points diametrically opmy invention I affix my signature in presenceposite, and mechanism, substantially as deof two Witnesses. scribed,connecting said double pawl with the l-IJ'ALMAR LINDESTROM. 5cutter-bar, whereby the reciprocating move- Vitnesses:

ment of the former is imparted to the latter, TAYLOR E. BROWN,

all substantially as set forth. v CHRISTOPHER ANDERSON.

